The driver’s edition number is 261.00,apart form supporting GeForce GTX 580,it also supports some graphics card which are not released,like GeForce GTS 455,GeForce GT 555M,etc.Perhaps GeForce GTS 455 will be based on GF104 core,but the amount of CUDA Core will decrease,while GeForce GT 555M possibly will become NVIDIA next-generation mainstream mobile GPU.